In situ gamma-ray spectrometry for environmental monitoring: a semi empirical calibration method

Radiation Protection Dosimetry
Jonas BosonLennart Johansson

Abstract

In situ gamma spectrometry using high-purity germanium (HPGe) detectors is a frequently used method for the determination of radionuclide ground deposition levels. Such measurements do, however, require an efficiency calibration based on detector sensitivity and parameters such as soil density and vertical activity distribution. In this work, a novel expression is used for the detector efficiency, incorporating both the influence of photon energy and incidence angle. Detector-specific efficiency data are determined empirically. For the theoretical calculation of the photon fluence at the detector, a three-layer model of finite thickness is developed for the description of soil density and vertical activity distribution. In order to facilitate the calibration of in situ measurements, a PC program has been developed to enable rapid, on-site calculations of radionuclide ground deposition levels. The semi empirical calibration method was tested on in situ measurements with two different detectors, and the results show good agreement with results obtained from traditional soil sampling.

References

Jul 1, 1988·Health Physics·I K Helfer, K M Miller
Feb 1, 1985·Health Physics·D C Kocher, A L Sjoreen
Sep 25, 2004·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·D KrstićM Jelić

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Citations

Apr 10, 2013·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Alecsandru ChiroscaOctavian Sima
May 12, 2009·Radiation Protection Dosimetry·Jonas BosonGöran Agren
Jan 18, 2016·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·D S GrozdovYu E Lavrukhin
Feb 18, 2012·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·J Carrazana GonzálezM Jurado Vargas
Jan 5, 2011·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·K AgrafiotisM J Anagnostakis
Jul 17, 2009·Journal of Environmental Radioactivity·Jonas BosonLennart Johansson
Jul 4, 2019·Radiation Protection Dosimetry·Jun-Ho Lee, Jong-In Byun

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